I put my Ni-MH 2700mAH batteries in the charger as I've done before, and pressed the refresh button. A little while later I noticed that 2 of the battery symbols looked like the batteries had a full charge (4 bars) and the entire battery icon was blinking (never saw that before). The other 2 each showed 1 bar, but nothing was blinking (usually during a refresh or charge the bars blink). I thought I'd look in the manual for help but I can't find it.